SU982881A1 - Method of dressing worm grinding wheel - Google Patents

Description

The invention relates to mechanical engineering and can be used for grinding gears.

A known method of editing a worm grinding wheel, according to which editing is carried out by a multi-thread roller, the profile angle of which is greater than the profile angle of the grinding wheel [1].

This method does not provide the possibility of dressing the grinding wheel, intended for grinding teeth with a flanked profile, as it does not create the necessary shape of the profile of the turns of the circle.

The aim of the invention is the expansion of technological capabilities by providing the possibility of grinding teeth with a flanked profile.

This goal is achieved by the fact that the axis of the roller is positioned at a crossing angle to the axis of the grinding wheel, exceeding twice the angle of elevation 2.

, the number of turns of the circle, and the thread pitch is selected depending on the angle of crossing in accordance with the formula cosu>

⁵ Р - о cos (A ~ ω) \ where t ₀ is the axial step of the turns of the grinding wheel;

co - the angle of elevation of the coils of a thin section »0 shafts of a wide circle;

λ is the Angle between the axes p © yika and the grinding wheel.

In FIG. 1 shows an example of machining ^{, 5} ki of a two-way worm grinding wheel with a roller with two threads; in FIG. 2 - a scan of the helical lines of the turns of a worm grinding wheel and the location of the roller axis with respect to them; in FIG. 3 ~ profile of a circle in cross section by a plane passing through the axis of the circle obtained when editing with a roller with a straight profile; at .982881 4 FIG. 4 - tooth profile of the grinding wheel.

To straighten the worm grinding wheel 1, the axis of the roller 2 is set relative to the axis of the wheel at a torsion angle A of at least two times the angle w of turning the coils! ha, and the step of the thread of the roller should be equal to the calculated value of tp.

The profile of the roller is rectilinear * 0 with the vertex angle equal to 2 (b, and the angle p of the profile of the roller is greater than the angle oL of the profile of the grinding wheel.

Straightening wheel is carried out by po- cottages rotating roller ¹⁵ on the infeed.

Example. Editing a worm circle with a diameter of 300 mm and a 3.5 mm module with the number of i-2 passes for grinding 20 wheels with a profile angle of 20 ° is carried out with two threads.

The angle of elevation of the turns of the circle o> = = 1 ° 22 ^f 38 ”. To obtain a flanked profile of the wheels with a flange value of ²⁵ 12 μm, the roller is mounted relative to the axis of the circle at a crossing angle L = 3 ω = 4 ° 07'54.

The axial pitch of the turns of the circle t ₀ = = 10,998 mm, normal pitch = 30 = 10,996 mm, the pitch between the threads of the roller is equal to ^τ ρ ^g о οοδ (λ-ω) '3 $

The angle of the profile of the roller is taken p = 20 ° 02 '. The profile of the roller is taken straightforward. 40

The method provides a flanked tooth shape of a grinding wheel, different from the involute shape by a cut at the head and at the tooth leg. _{4 $}

Thus, this method of dressing the grinding wheel provides the ability to grind the teeth x flanked profile.

The presence of a flank on the wheels reduces noise during their operation to 2-5 dB | and also makes it possible to reduce the complexity and cost of manufacturing the wheels, since in the case of manufacturing wheels with an unflanked profile, but with the same noise level, they must be performed with higher accuracy.

Claims (1)

(5) METHOD FOR CORRECTIONAL GRINDING EDGE. CIRCLE The invention relates to mechanical engineering and can be used in grinding gears. There is a known method of dressing a worm grinding wheel, according to which the dressing is performed with a multi-threading roller, the profile angle of which is greater than the angle angle of the grinding wheel 1. This method does not allow the grinding wheel to be edited for grinding teeth with a flanked profile, since it does not create the necessary shape for the filing of the turns of the wheel. The aim of the invention is the expansion of technological capabilities by enabling the grinding of teeth with a flanked profile. This goal is achieved by placing the axis of the roller at an angle of crossing to the axis of the grinding wheel, exceeding twice the angle of elevation of the turns of the wheel, and the pitch of the threads is selected depending on the angle of crossing in accordance with the formula P o cosTA t where circle; UJ is the angle of elevation of the turns of the grinding wheel; A is the angle of the Crossing between the core and the grinding wheel. FIG. 1 shows an example of processing a two-way worm grinding wheel with a two-thread roller; in fig. 2 - scanning of the helical lines of the turns of the black grinding wheel and location of the roller axis with respect to them; in fig. 3 - profile of a circle in cross section by a plane passing through the axis of the circle, obtained when straightening with a roller with a linear profile; in fig. - the profile of the tooth grinding wheel. To edit the worm grinding wheel, 1 axis of roller 2 is set relative to the axis of the circle at a twisting angle D not less than twice the angle to lift the turns of the circle, and the pitch of the threads of the roller should be equal to the calculated value of tp. The profile of the roller is linear with: the angle at the apex is 2 /), the angle of the profile of the roller being greater than the angle oL of the profile of the Grinding Circle. Editing of the circle is carried out by letting the rotating roller cut in. Example. The editing of a worm gear with a diameter of 300 mm modulo mm with the number of runs i-2 for grinding wheels with a profile angle of 20 is two-thread. The angle of elevation of the turns of the circle "1 22z8. To obtain a flanked profile of wheels with a flank size of 12 µm, the roller is mounted relative to the axis of the circle at an angle of the cross L 301. The pitch of the circle t is 10.998 mm, the normal pitch is jj 10.996 mm, the pitch between the threads of the roller is equal to J. -4-COS U) :: 41.008 GMM. COS; A-IJL) The angle of the profile of the roller is taken by / i 20 ° 02. Roller profile is taken with linear. The method provides obtaining a flaked tooth shape of a ground wheel that differs from an involute shape by a cut at the head and at the foot of the tooth. Thus, this method of grinding wheel grinding provides the POSSIBILITY of grinding teeth, with a flanked profile. The presence of the flanks on the wheels allows noise during operation up to 2-5 dB and also makes it possible to reduce the labor intensity and cost of the wheels, since in the case of manufacturing wheels with a non-flanked profile, but with the same noise level, they must be performed with a higher accuracy. Claims of a worm grinding wheel, according to which a laundress is carried out with a multi-thread roller whose profile angle is greater than the angle profile of the grinding wheel, characterized in that, in order to expand technological capabilities by making it possible to grind the teeth with a flanked profile, the roller axis is at an angle of crossing to the axis of the grinding wheel, exceeding twice the value of the angle of lifting of the turns of the circle, and the pitch of the thread is selected depending on the angle of crossing in accordance with dance with the formula, cos UJ r o cos (A-u)) where t - the axial pitch of the grinding wheel; U - the angle of elevation of the turns of the grinding wheel; L is the angle of intersection between the axis of the roller and the grinding wheel. Sources of information taken into account during the examination 1. MP Merpert. Precision thread grinding machines. M., Mashgiz, 1962, p. 159-161. 1